<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>文本</title>

    <style>

        span{
            font-size: 50px;
       }


    </style>
</head>
<body>
<font size="4px" color="red">我是一段文本</font>
<span >我也是一段文本</span>
</body>
</html>